os3_solaris.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package runtime
     6  
     7  import (
     8  	"internal/abi"
     9  	"internal/goarch"
    10  	"internal/runtime/atomic"
    11  	"unsafe"
    12  )
    13  
    14  //go:cgo_export_dynamic runtime.end _end
    15  //go:cgo_export_dynamic runtime.etext _etext
    16  //go:cgo_export_dynamic runtime.edata _edata
    17  
    18  //go:cgo_import_dynamic libc____errno ___errno "libc.so"
    19  //go:cgo_import_dynamic libc_clock_gettime clock_gettime "libc.so"
    20  //go:cgo_import_dynamic libc_exit _exit "libc.so"
    21  //go:cgo_import_dynamic libc_getcontext getcontext "libc.so"
    22  //go:cgo_import_dynamic libc_kill kill "libc.so"
    23  //go:cgo_import_dynamic libc_madvise madvise "libc.so"
    24  //go:cgo_import_dynamic libc_malloc malloc "libc.so"
    25  //go:cgo_import_dynamic libc_mmap mmap "libc.so"
    26  //go:cgo_import_dynamic libc_munmap munmap "libc.so"
    27  //go:cgo_import_dynamic libc_open open "libc.so"
    28  //go:cgo_import_dynamic libc_pthread_attr_destroy pthread_attr_destroy "libc.so"
    29  //go:cgo_import_dynamic libc_pthread_attr_getstack pthread_attr_getstack "libc.so"
    30  //go:cgo_import_dynamic libc_pthread_attr_init pthread_attr_init "libc.so"
    31  //go:cgo_import_dynamic libc_pthread_attr_setdetachstate pthread_attr_setdetachstate "libc.so"
    32  //go:cgo_import_dynamic libc_pthread_attr_setstack pthread_attr_setstack "libc.so"
    33  //go:cgo_import_dynamic libc_pthread_create pthread_create "libc.so"
    34  //go:cgo_import_dynamic libc_pthread_self pthread_self "libc.so"
    35  //go:cgo_import_dynamic libc_pthread_kill pthread_kill "libc.so"
    36  //go:cgo_import_dynamic libc_raise raise "libc.so"
    37  //go:cgo_import_dynamic libc_read read "libc.so"
    38  //go:cgo_import_dynamic libc_select select "libc.so"
    39  //go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so"
    40  //go:cgo_import_dynamic libc_sem_init sem_init "libc.so"
    41  //go:cgo_import_dynamic libc_sem_post sem_post "libc.so"
    42  //go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so"
    43  //go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
    44  //go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
    45  //go:cgo_import_dynamic libc_sigaction sigaction "libc.so"
    46  //go:cgo_import_dynamic libc_sigaltstack sigaltstack "libc.so"
    47  //go:cgo_import_dynamic libc_sigprocmask sigprocmask "libc.so"
    48  //go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
    49  //go:cgo_import_dynamic libc_usleep usleep "libc.so"
    50  //go:cgo_import_dynamic libc_write write "libc.so"
    51  //go:cgo_import_dynamic libc_pipe2 pipe2 "libc.so"
    52  
    53  //go:linkname libc____errno libc____errno
    54  //go:linkname libc_clock_gettime libc_clock_gettime
    55  //go:linkname libc_exit libc_exit
    56  //go:linkname libc_getcontext libc_getcontext
    57  //go:linkname libc_kill libc_kill
    58  //go:linkname libc_madvise libc_madvise
    59  //go:linkname libc_malloc libc_malloc
    60  //go:linkname libc_mmap libc_mmap
    61  //go:linkname libc_munmap libc_munmap
    62  //go:linkname libc_open libc_open
    63  //go:linkname libc_pthread_attr_destroy libc_pthread_attr_destroy
    64  //go:linkname libc_pthread_attr_getstack libc_pthread_attr_getstack
    65  //go:linkname libc_pthread_attr_init libc_pthread_attr_init
    66  //go:linkname libc_pthread_attr_setdetachstate libc_pthread_attr_setdetachstate
    67  //go:linkname libc_pthread_attr_setstack libc_pthread_attr_setstack
    68  //go:linkname libc_pthread_create libc_pthread_create
    69  //go:linkname libc_pthread_self libc_pthread_self
    70  //go:linkname libc_pthread_kill libc_pthread_kill
    71  //go:linkname libc_raise libc_raise
    72  //go:linkname libc_read libc_read
    73  //go:linkname libc_select libc_select
    74  //go:linkname libc_sched_yield libc_sched_yield
    75  //go:linkname libc_sem_init libc_sem_init
    76  //go:linkname libc_sem_post libc_sem_post
    77  //go:linkname libc_sem_reltimedwait_np libc_sem_reltimedwait_np
    78  //go:linkname libc_sem_wait libc_sem_wait
    79  //go:linkname libc_setitimer libc_setitimer
    80  //go:linkname libc_sigaction libc_sigaction
    81  //go:linkname libc_sigaltstack libc_sigaltstack
    82  //go:linkname libc_sigprocmask libc_sigprocmask
    83  //go:linkname libc_sysconf libc_sysconf
    84  //go:linkname libc_usleep libc_usleep
    85  //go:linkname libc_write libc_write
    86  //go:linkname libc_pipe2 libc_pipe2
    87  
    88  var (
    89  	libc____errno,
    90  	libc_clock_gettime,
    91  	libc_exit,
    92  	libc_getcontext,
    93  	libc_kill,
    94  	libc_madvise,
    95  	libc_malloc,
    96  	libc_mmap,
    97  	libc_munmap,
    98  	libc_open,
    99  	libc_pthread_attr_destroy,
   100  	libc_pthread_attr_getstack,
   101  	libc_pthread_attr_init,
   102  	libc_pthread_attr_setdetachstate,
   103  	libc_pthread_attr_setstack,
   104  	libc_pthread_create,
   105  	libc_pthread_self,
   106  	libc_pthread_kill,
   107  	libc_raise,
   108  	libc_read,
   109  	libc_sched_yield,
   110  	libc_select,
   111  	libc_sem_init,
   112  	libc_sem_post,
   113  	libc_sem_reltimedwait_np,
   114  	libc_sem_wait,
   115  	libc_setitimer,
   116  	libc_sigaction,
   117  	libc_sigaltstack,
   118  	libc_sigprocmask,
   119  	libc_sysconf,
   120  	libc_usleep,
   121  	libc_write,
   122  	libc_pipe2 libcFunc
   123  )
   124  
   125  var sigset_all = sigset{[4]uint32{^uint32(0), ^uint32(0), ^uint32(0), ^uint32(0)}}
   126  
   127  func getPageSize() uintptr {
   128  	n := int32(sysconf(__SC_PAGESIZE))
   129  	if n <= 0 {
   130  		return 0
   131  	}
   132  	return uintptr(n)
   133  }
   134  
   135  func osinit() {
   136  	// Call miniterrno so that we can safely make system calls
   137  	// before calling minit on m0.
   138  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   139  
   140  	ncpu = getncpu()
   141  	if physPageSize == 0 {
   142  		physPageSize = getPageSize()
   143  	}
   144  }
   145  
   146  func tstart_sysvicall(newm *m) uint32
   147  
   148  // May run with m.p==nil, so write barriers are not allowed.
   149  //
   150  //go:nowritebarrier
   151  func newosproc(mp *m) {
   152  	var (
   153  		attr pthreadattr
   154  		oset sigset
   155  		tid  pthread
   156  		ret  int32
   157  		size uint64
   158  	)
   159  
   160  	if pthread_attr_init(&attr) != 0 {
   161  		throw("pthread_attr_init")
   162  	}
   163  	// Allocate a new 2MB stack.
   164  	if pthread_attr_setstack(&attr, 0, 0x200000) != 0 {
   165  		throw("pthread_attr_setstack")
   166  	}
   167  	// Read back the allocated stack.
   168  	if pthread_attr_getstack(&attr, unsafe.Pointer(&mp.g0.stack.hi), &size) != 0 {
   169  		throw("pthread_attr_getstack")
   170  	}
   171  	mp.g0.stack.lo = mp.g0.stack.hi - uintptr(size)
   172  	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
   173  		throw("pthread_attr_setdetachstate")
   174  	}
   175  
   176  	// Disable signals during create, so that the new thread starts
   177  	// with signals disabled. It will enable them in minit.
   178  	sigprocmask(_SIG_SETMASK, &sigset_all, &oset)
   179  	ret = retryOnEAGAIN(func() int32 {
   180  		return pthread_create(&tid, &attr, abi.FuncPCABI0(tstart_sysvicall), unsafe.Pointer(mp))
   181  	})
   182  	sigprocmask(_SIG_SETMASK, &oset, nil)
   183  	if ret != 0 {
   184  		print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", ret, ")\n")
   185  		if ret == _EAGAIN {
   186  			println("runtime: may need to increase max user processes (ulimit -u)")
   187  		}
   188  		throw("newosproc")
   189  	}
   190  }
   191  
   192  func exitThread(wait *atomic.Uint32) {
   193  	// We should never reach exitThread on Solaris because we let
   194  	// libc clean up threads.
   195  	throw("exitThread")
   196  }
   197  
   198  var urandom_dev = []byte("/dev/urandom\x00")
   199  
   200  //go:nosplit
   201  func readRandom(r []byte) int {
   202  	fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
   203  	n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
   204  	closefd(fd)
   205  	return int(n)
   206  }
   207  
   208  func goenvs() {
   209  	goenvs_unix()
   210  }
   211  
   212  // Called to initialize a new m (including the bootstrap m).
   213  // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
   214  func mpreinit(mp *m) {
   215  	mp.gsignal = malg(32 * 1024)
   216  	mp.gsignal.m = mp
   217  }
   218  
   219  func miniterrno()
   220  
   221  // Called to initialize a new m (including the bootstrap m).
   222  // Called on the new thread, cannot allocate memory.
   223  func minit() {
   224  	asmcgocall(unsafe.Pointer(abi.FuncPCABI0(miniterrno)), unsafe.Pointer(&libc____errno))
   225  
   226  	minitSignals()
   227  
   228  	getg().m.procid = uint64(pthread_self())
   229  }
   230  
   231  // Called from dropm to undo the effect of an minit.
   232  func unminit() {
   233  	unminitSignals()
   234  	getg().m.procid = 0
   235  }
   236  
   237  // Called from mexit, but not from dropm, to undo the effect of thread-owned
   238  // resources in minit, semacreate, or elsewhere. Do not take locks after calling this.
   239  //
   240  // This always runs without a P, so //go:nowritebarrierrec is required.
   241  //go:nowritebarrierrec
   242  func mdestroy(mp *m) {
   243  }
   244  
   245  func sigtramp()
   246  
   247  //go:nosplit
   248  //go:nowritebarrierrec
   249  func setsig(i uint32, fn uintptr) {
   250  	var sa sigactiont
   251  
   252  	sa.sa_flags = _SA_SIGINFO | _SA_ONSTACK | _SA_RESTART
   253  	sa.sa_mask = sigset_all
   254  	if fn == abi.FuncPCABIInternal(sighandler) { // abi.FuncPCABIInternal(sighandler) matches the callers in signal_unix.go
   255  		fn = abi.FuncPCABI0(sigtramp)
   256  	}
   257  	*((*uintptr)(unsafe.Pointer(&sa._funcptr))) = fn
   258  	sigaction(i, &sa, nil)
   259  }
   260  
   261  //go:nosplit
   262  //go:nowritebarrierrec
   263  func setsigstack(i uint32) {
   264  	var sa sigactiont
   265  	sigaction(i, nil, &sa)
   266  	if sa.sa_flags&_SA_ONSTACK != 0 {
   267  		return
   268  	}
   269  	sa.sa_flags |= _SA_ONSTACK
   270  	sigaction(i, &sa, nil)
   271  }
   272  
   273  //go:nosplit
   274  //go:nowritebarrierrec
   275  func getsig(i uint32) uintptr {
   276  	var sa sigactiont
   277  	sigaction(i, nil, &sa)
   278  	return *((*uintptr)(unsafe.Pointer(&sa._funcptr)))
   279  }
   280  
   281  // setSignalstackSP sets the ss_sp field of a stackt.
   282  //
   283  //go:nosplit
   284  func setSignalstackSP(s *stackt, sp uintptr) {
   285  	*(*uintptr)(unsafe.Pointer(&s.ss_sp)) = sp
   286  }
   287  
   288  //go:nosplit
   289  //go:nowritebarrierrec
   290  func sigaddset(mask *sigset, i int) {
   291  	mask.__sigbits[(i-1)/32] |= 1 << ((uint32(i) - 1) & 31)
   292  }
   293  
   294  func sigdelset(mask *sigset, i int) {
   295  	mask.__sigbits[(i-1)/32] &^= 1 << ((uint32(i) - 1) & 31)
   296  }
   297  
   298  //go:nosplit
   299  func (c *sigctxt) fixsigcode(sig uint32) {
   300  }
   301  
   302  func setProcessCPUProfiler(hz int32) {
   303  	setProcessCPUProfilerTimer(hz)
   304  }
   305  
   306  func setThreadCPUProfiler(hz int32) {
   307  	setThreadCPUProfilerHz(hz)
   308  }
   309  
   310  //go:nosplit
   311  func validSIGPROF(mp *m, c *sigctxt) bool {
   312  	return true
   313  }
   314  
   315  //go:nosplit
   316  func semacreate(mp *m) {
   317  	if mp.waitsema != 0 {
   318  		return
   319  	}
   320  
   321  	var sem *semt
   322  
   323  	// Call libc's malloc rather than malloc. This will
   324  	// allocate space on the C heap. We can't call malloc
   325  	// here because it could cause a deadlock.
   326  	mp.libcall.fn = uintptr(unsafe.Pointer(&libc_malloc))
   327  	mp.libcall.n = 1
   328  	mp.scratch = mscratch{}
   329  	mp.scratch.v[0] = unsafe.Sizeof(*sem)
   330  	mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   331  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   332  	sem = (*semt)(unsafe.Pointer(mp.libcall.r1))
   333  	if sem_init(sem, 0, 0) != 0 {
   334  		throw("sem_init")
   335  	}
   336  	mp.waitsema = uintptr(unsafe.Pointer(sem))
   337  }
   338  
   339  //go:nosplit
   340  func semasleep(ns int64) int32 {
   341  	mp := getg().m
   342  	if ns >= 0 {
   343  		mp.ts.tv_sec = ns / 1000000000
   344  		mp.ts.tv_nsec = ns % 1000000000
   345  
   346  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_reltimedwait_np))
   347  		mp.libcall.n = 2
   348  		mp.scratch = mscratch{}
   349  		mp.scratch.v[0] = mp.waitsema
   350  		mp.scratch.v[1] = uintptr(unsafe.Pointer(&mp.ts))
   351  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   352  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   353  		if *mp.perrno != 0 {
   354  			if *mp.perrno == _ETIMEDOUT || *mp.perrno == _EAGAIN || *mp.perrno == _EINTR {
   355  				return -1
   356  			}
   357  			throw("sem_reltimedwait_np")
   358  		}
   359  		return 0
   360  	}
   361  	for {
   362  		mp.libcall.fn = uintptr(unsafe.Pointer(&libc_sem_wait))
   363  		mp.libcall.n = 1
   364  		mp.scratch = mscratch{}
   365  		mp.scratch.v[0] = mp.waitsema
   366  		mp.libcall.args = uintptr(unsafe.Pointer(&mp.scratch))
   367  		asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&mp.libcall))
   368  		if mp.libcall.r1 == 0 {
   369  			break
   370  		}
   371  		if *mp.perrno == _EINTR {
   372  			continue
   373  		}
   374  		throw("sem_wait")
   375  	}
   376  	return 0
   377  }
   378  
   379  //go:nosplit
   380  func semawakeup(mp *m) {
   381  	if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
   382  		throw("sem_post")
   383  	}
   384  }
   385  
   386  //go:nosplit
   387  func closefd(fd int32) int32 {
   388  	return int32(sysvicall1(&libc_close, uintptr(fd)))
   389  }
   390  
   391  //go:nosplit
   392  func exit(r int32) {
   393  	sysvicall1(&libc_exit, uintptr(r))
   394  }
   395  
   396  //go:nosplit
   397  func getcontext(context *ucontext) /* int32 */ {
   398  	sysvicall1(&libc_getcontext, uintptr(unsafe.Pointer(context)))
   399  }
   400  
   401  //go:nosplit
   402  func madvise(addr unsafe.Pointer, n uintptr, flags int32) {
   403  	sysvicall3(&libc_madvise, uintptr(addr), uintptr(n), uintptr(flags))
   404  }
   405  
   406  //go:nosplit
   407  func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
   408  	p, err := doMmap(uintptr(addr), n, uintptr(prot), uintptr(flags), uintptr(fd), uintptr(off))
   409  	if p == ^uintptr(0) {
   410  		return nil, int(err)
   411  	}
   412  	return unsafe.Pointer(p), 0
   413  }
   414  
   415  //go:nosplit
   416  //go:cgo_unsafe_args
   417  func doMmap(addr, n, prot, flags, fd, off uintptr) (uintptr, uintptr) {
   418  	var libcall libcall
   419  	libcall.fn = uintptr(unsafe.Pointer(&libc_mmap))
   420  	libcall.n = 6
   421  	libcall.args = uintptr(noescape(unsafe.Pointer(&addr)))
   422  	asmcgocall(unsafe.Pointer(&asmsysvicall6x), unsafe.Pointer(&libcall))
   423  	return libcall.r1, libcall.err
   424  }
   425  
   426  //go:nosplit
   427  func munmap(addr unsafe.Pointer, n uintptr) {
   428  	sysvicall2(&libc_munmap, uintptr(addr), uintptr(n))
   429  }
   430  
   431  const (
   432  	_CLOCK_REALTIME  = 3
   433  	_CLOCK_MONOTONIC = 4
   434  )
   435  
   436  //go:nosplit
   437  func nanotime1() int64 {
   438  	var ts mts
   439  	sysvicall2(&libc_clock_gettime, _CLOCK_MONOTONIC, uintptr(unsafe.Pointer(&ts)))
   440  	return ts.tv_sec*1e9 + ts.tv_nsec
   441  }
   442  
   443  //go:nosplit
   444  func open(path *byte, mode, perm int32) int32 {
   445  	return int32(sysvicall3(&libc_open, uintptr(unsafe.Pointer(path)), uintptr(mode), uintptr(perm)))
   446  }
   447  
   448  func pthread_attr_destroy(attr *pthreadattr) int32 {
   449  	return int32(sysvicall1(&libc_pthread_attr_destroy, uintptr(unsafe.Pointer(attr))))
   450  }
   451  
   452  func pthread_attr_getstack(attr *pthreadattr, addr unsafe.Pointer, size *uint64) int32 {
   453  	return int32(sysvicall3(&libc_pthread_attr_getstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(unsafe.Pointer(size))))
   454  }
   455  
   456  func pthread_attr_init(attr *pthreadattr) int32 {
   457  	return int32(sysvicall1(&libc_pthread_attr_init, uintptr(unsafe.Pointer(attr))))
   458  }
   459  
   460  func pthread_attr_setdetachstate(attr *pthreadattr, state int32) int32 {
   461  	return int32(sysvicall2(&libc_pthread_attr_setdetachstate, uintptr(unsafe.Pointer(attr)), uintptr(state)))
   462  }
   463  
   464  func pthread_attr_setstack(attr *pthreadattr, addr uintptr, size uint64) int32 {
   465  	return int32(sysvicall3(&libc_pthread_attr_setstack, uintptr(unsafe.Pointer(attr)), uintptr(addr), uintptr(size)))
   466  }
   467  
   468  func pthread_create(thread *pthread, attr *pthreadattr, fn uintptr, arg unsafe.Pointer) int32 {
   469  	return int32(sysvicall4(&libc_pthread_create, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(fn), uintptr(arg)))
   470  }
   471  
   472  func pthread_self() pthread {
   473  	return pthread(sysvicall0(&libc_pthread_self))
   474  }
   475  
   476  func signalM(mp *m, sig int) {
   477  	sysvicall2(&libc_pthread_kill, uintptr(pthread(mp.procid)), uintptr(sig))
   478  }
   479  
   480  //go:nosplit
   481  //go:nowritebarrierrec
   482  func raise(sig uint32) /* int32 */ {
   483  	sysvicall1(&libc_raise, uintptr(sig))
   484  }
   485  
   486  func raiseproc(sig uint32) /* int32 */ {
   487  	pid := sysvicall0(&libc_getpid)
   488  	sysvicall2(&libc_kill, pid, uintptr(sig))
   489  }
   490  
   491  //go:nosplit
   492  func read(fd int32, buf unsafe.Pointer, nbyte int32) int32 {
   493  	r1, err := sysvicall3Err(&libc_read, uintptr(fd), uintptr(buf), uintptr(nbyte))
   494  	if c := int32(r1); c >= 0 {
   495  		return c
   496  	}
   497  	return -int32(err)
   498  }
   499  
   500  //go:nosplit
   501  func sem_init(sem *semt, pshared int32, value uint32) int32 {
   502  	return int32(sysvicall3(&libc_sem_init, uintptr(unsafe.Pointer(sem)), uintptr(pshared), uintptr(value)))
   503  }
   504  
   505  //go:nosplit
   506  func sem_post(sem *semt) int32 {
   507  	return int32(sysvicall1(&libc_sem_post, uintptr(unsafe.Pointer(sem))))
   508  }
   509  
   510  //go:nosplit
   511  func sem_reltimedwait_np(sem *semt, timeout *timespec) int32 {
   512  	return int32(sysvicall2(&libc_sem_reltimedwait_np, uintptr(unsafe.Pointer(sem)), uintptr(unsafe.Pointer(timeout))))
   513  }
   514  
   515  //go:nosplit
   516  func sem_wait(sem *semt) int32 {
   517  	return int32(sysvicall1(&libc_sem_wait, uintptr(unsafe.Pointer(sem))))
   518  }
   519  
   520  func setitimer(which int32, value *itimerval, ovalue *itimerval) /* int32 */ {
   521  	sysvicall3(&libc_setitimer, uintptr(which), uintptr(unsafe.Pointer(value)), uintptr(unsafe.Pointer(ovalue)))
   522  }
   523  
   524  //go:nosplit
   525  //go:nowritebarrierrec
   526  func sigaction(sig uint32, act *sigactiont, oact *sigactiont) /* int32 */ {
   527  	sysvicall3(&libc_sigaction, uintptr(sig), uintptr(unsafe.Pointer(act)), uintptr(unsafe.Pointer(oact)))
   528  }
   529  
   530  //go:nosplit
   531  //go:nowritebarrierrec
   532  func sigaltstack(ss *stackt, oss *stackt) /* int32 */ {
   533  	sysvicall2(&libc_sigaltstack, uintptr(unsafe.Pointer(ss)), uintptr(unsafe.Pointer(oss)))
   534  }
   535  
   536  //go:nosplit
   537  //go:nowritebarrierrec
   538  func sigprocmask(how int32, set *sigset, oset *sigset) /* int32 */ {
   539  	sysvicall3(&libc_sigprocmask, uintptr(how), uintptr(unsafe.Pointer(set)), uintptr(unsafe.Pointer(oset)))
   540  }
   541  
   542  func sysconf(name int32) int64 {
   543  	return int64(sysvicall1(&libc_sysconf, uintptr(name)))
   544  }
   545  
   546  func usleep1(usec uint32)
   547  
   548  //go:nosplit
   549  func usleep_no_g(µs uint32) {
   550  	usleep1(µs)
   551  }
   552  
   553  //go:nosplit
   554  func usleep(µs uint32) {
   555  	usleep1(µs)
   556  }
   557  
   558  func walltime() (sec int64, nsec int32) {
   559  	var ts mts
   560  	sysvicall2(&libc_clock_gettime, _CLOCK_REALTIME, uintptr(unsafe.Pointer(&ts)))
   561  	return ts.tv_sec, int32(ts.tv_nsec)
   562  }
   563  
   564  //go:nosplit
   565  func write1(fd uintptr, buf unsafe.Pointer, nbyte int32) int32 {
   566  	r1, err := sysvicall3Err(&libc_write, fd, uintptr(buf), uintptr(nbyte))
   567  	if c := int32(r1); c >= 0 {
   568  		return c
   569  	}
   570  	return -int32(err)
   571  }
   572  
   573  //go:nosplit
   574  func pipe2(flags int32) (r, w int32, errno int32) {
   575  	var p [2]int32
   576  	_, e := sysvicall2Err(&libc_pipe2, uintptr(noescape(unsafe.Pointer(&p))), uintptr(flags))
   577  	return p[0], p[1], int32(e)
   578  }
   579  
   580  //go:nosplit
   581  func fcntl(fd, cmd, arg int32) (ret int32, errno int32) {
   582  	r1, err := sysvicall3Err(&libc_fcntl, uintptr(fd), uintptr(cmd), uintptr(arg))
   583  	return int32(r1), int32(err)
   584  }
   585  
   586  func osyield1()
   587  
   588  //go:nosplit
   589  func osyield_no_g() {
   590  	osyield1()
   591  }
   592  
   593  //go:nosplit
   594  func osyield() {
   595  	sysvicall0(&libc_sched_yield)
   596  }
   597  
   598  //go:linkname executablePath os.executablePath
   599  var executablePath string
   600  
   601  func sysargs(argc int32, argv **byte) {
   602  	n := argc + 1
   603  
   604  	// skip over argv, envp to get to auxv
   605  	for argv_index(argv, n) != nil {
   606  		n++
   607  	}
   608  
   609  	// skip NULL separator
   610  	n++
   611  
   612  	// now argv+n is auxv
   613  	auxvp := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*goarch.PtrSize))
   614  	pairs := sysauxv(auxvp[:])
   615  	auxv = auxvp[: pairs*2 : pairs*2]
   616  }
   617  
   618  const (
   619  	_AT_NULL         = 0    // Terminates the vector
   620  	_AT_PAGESZ       = 6    // Page size in bytes
   621  	_AT_SUN_EXECNAME = 2014 // exec() path name
   622  )
   623  
   624  func sysauxv(auxv []uintptr) (pairs int) {
   625  	var i int
   626  	for i = 0; auxv[i] != _AT_NULL; i += 2 {
   627  		tag, val := auxv[i], auxv[i+1]
   628  		switch tag {
   629  		case _AT_PAGESZ:
   630  			physPageSize = val
   631  		case _AT_SUN_EXECNAME:
   632  			executablePath = gostringnocopy((*byte)(unsafe.Pointer(val)))
   633  		}
   634  	}
   635  	return i / 2
   636  }
   637  
   638  // sigPerThreadSyscall is only used on linux, so we assign a bogus signal
   639  // number.
   640  const sigPerThreadSyscall = 1 << 31
   641  
   642  //go:nosplit
   643  func runPerThreadSyscall() {
   644  	throw("runPerThreadSyscall only valid on linux")
   645  }
   646
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